Organic light emitting display device
An organic light emitting display device is provided. The organic light emitting display device includes a first substrate including a black matrix on one surface, an overcoating layer formed of a semi-permeable material and configured to equalize a thickness of an area where the black matrix is present to a thickness of an area where the black matrix is not present, and a touch electrode layer on the overcoating layer; and a second substrate including an organic light emitting element on one surface and bonded to the first substrate to face each other.
1. An organic light emitting display device, comprising:
a first substrate;
a black matrix including a first surface on one surface of the first substrate;
an overcoating layer including a semi-permeable material that reduces a transmissivity of visible light at a certain ratio, the overcoating layer shielding external light in place of a separate polarizer, the overcoating layer being configured to equalize a thickness of an area where the black matrix is present to a thickness of an area where the black matrix is not present, the overcoating layer entirely covering a second surface of the black matrix opposite to the first surface of the black matrix;
a touch electrode layer on and directly contacting the overcoating layer, and spaced apart from the black matrix;
a second substrate;
an organic light emitting element on one surface of the second substrate; and
an adhesive layer between the touch electrode layer and the organic light emitting element layer, the adhesive layer covering and directly contacting all conductive surfaces of the touch electrode layer other than a surface directly contacting the overcoating layer in a cross-sectional view, the adhesive layer being configured to bond the first substrate to the second substrate, such that the first substrate and the second substrate face each other.
2. The organic light emitting display device according to claim 1 , wherein the semi-permeable material of the overcoating layer has a visible light transmissivity of 45% to 80%.
3. The organic light emitting display device according to claim 2 , wherein the overcoating layer has a uniform transmissivity in the entire visible light wavelength range.
4. The organic light emitting display device according to claim 2 , wherein the semi-permeable material of the overcoating layer includes an organic dye homogeneously dissolved in a polymer.
5. The organic light emitting display device according to claim 2 , wherein the semi-permeable material of the overcoating layer includes at least one of: particle-shaped graphite, carbon nanoparticles, and carbon nanotubes, dispersed in a polymer.
6. The organic light emitting display device according to claim 2 , wherein the first substrate and the second substrate include films including at least one of: polyethylene naphthalate, polyethylene terephthalate, polyethylene ether phthalate, polycarbonate, polyarylate, polyetherimide, polyether sulfonate, polyimide, and polyacrylate.
7. A display device, comprising:
a first plastic substrate including:
a black matrix (BM);
a semi-permeable overcoating layer, the semi-permeable overcoating layer entirely covering a first surface of the BM opposite to a second surface of the BM in contact with the first plastic substrate; and
a touch sensor on the semi-permeable overcoating layer, the touch sensor being spaced apart from the BM, the touch sensor directly contacting the semi-permeable overcoating layer; and
a second plastic substrate on which pixels including an organic emission layer are disposed, each pixel including a pixel region;
an adhesive layer bonding the first plastic substrate to the second plastic substrate, the adhesive layer covering and directly contacting all conductive surfaces of the touch sensor other than a surface directly contacting the overcoating layer in a cross-sectional view; and
a cover plate attached to the first plastic substrate without a polarizer therebetween,
wherein the BM is positioned corresponding to a boundary of each pixel region,
wherein a bonding structure of the first plastic substrate and the second plastic substrate permits a foldable configuration, and
wherein the bonding structure includes the adhesive layer and the cover plate.
8. The display device according to claim 7 , wherein the overcoating layer is configured to reduce transmissivity of a visible light at an equal ratio.
9. The display device according to claim 7 , wherein:
the bonding structure of the first plastic substrate and the second plastic substrate has a thickness of 100 μm or less; and
the bonding structure of the first plastic substrate and the second plastic substrate permits the foldable configuration with a radius of curvature of 2.5 mm or less.
10. The display device according to claim 7 , wherein the overcoating includes a semi-permeable material having a visible light transmissivity of 45% to 80%.